Riveting machine



April 21, 1953 F. H. LEJEUNE 2,635,777

RIVETING MACHINE Filed Dec. 27, 1948 7 Sheets-Sheet l ELLE-rl IN VEN MR. fieA /v/ A. A: Jzwws- F. H. LEJEUNE RIVETING MACHINE April 21, 1953 7 Sheets-Sheet 3 Filed Dec. 27, 1948 w w m m ERA lwr 1: Jill/V5 ATTOR/VIYG RIVETING MACHINE Filed Dec. 27, 1948 7 Sheets-Sheet 6 IN VEN TOR.

FRANK H. zzJw/vz 7 BY Patented Apr. 21, 1953 UNITED STATES PATENT OFFICE 11 Claims.

The invention relates to riveting machines and refers more particularly to machines for riveting. linings to brake shoes.

The inventionhas for one of its objects to provide an improved construction of automatic riveting machine which accurately accomplishesthe riveting at a fast rate.

The invention has for another object to provide a machine for riveting two work elements by a plurality of series of rivets, themachinehaving independently operable riveter heads which are controlled independently of each other so that the spacing of the rivets in one series may be different than that, of the rivets in another series.

The invention has for further objects to provide a riveting machine having a rotatable work holder carrying peripheral anvils andalso having a reciprocable plunger movable substantially radially of the holder for cooperating withthe anvils to effect the riveting; to provide a riveting machine in which the work holder carries-means for controlling the operation of the plunger; to provide a riveting machine having means for automatically pressing one element of the work against the other element of the work during the riveting operation; to provide the riveting machine with means for properly positioning both of the work elements relativeto the holder; and to provide the riveting machine with means for properly positioning the work elements relative to each other.

With these as well as other objects in view the invention resides in the novel features of construction and combinations and arrangements of parts as more fully hereinafter set forth:

In the drawings:

Figure 1 is a front elevation of. the riveting machine;

Figure 2 is an enlarged view of'a portion thereof Figure 3 is a cross section on the line 3-3 of Figure 2;

Figure 4 is a cross section on the line 4-4 of Figure 3;

Figure 5 is a cross section on the line "5-5 of Figure 4;

Figure 6 is a cross section on the line 66 of Figure 4;

Figure? is a cross section on the line 'I--! of Figure 6;

Figures 8 and 9am cross sections on the line 8--B and 9-9 respectively ofFigure 5;

Figure 10 is a cross section on the line Ill-l0 of Figure 4;

Figure 11 is an enlarged sectional view of a portion of theriveting mechanism i Figure '12 is an elevation of a portion of the work holder;

Figure 13 is a cross section taken on the line 13-43 of Figure 3;, and

Figure 14 is across section on the line M-M of Figure 4.

As illustrated in the present instance, the rivet machine is designed to rivet linings to brake shoes, the latter being webbed and more particularly of T-cross section.

The riveting machine has the pair of independent like riveter heads I, the construction of e'ach. riveter head being conventional and its operation being well known to those skilled in the art. Generally, each riveter head comprises the frame 2, the rivet hopper 3, the rivet carrier 4. to which thhe rivets are successively conducted by a chute leading from thehopper, the vertically reciprocable rivet carrier slide 5, the vertically reciprocable rivet driver 6 which is in the nature of a plunger and the vertically reciprocable rivet driver slide 1. The rivet driver slide 7 is connected to the crank a of the crank shaft 9 which is journalled in the frame 2. The crank shaft has journalled on its end the fly wheel lil which is adapted to be operatively connected to the crank shaft by the conventional clutch H. The fly wheel is also adapted to be drive'nt by suitable means such as the electric motor l2 operatively connected to the fly wheel by a belt.

The riveting machine also has the work holder [3 which is provided with the channel It for receiving the webs [5 of a pair of angularly spaced peripheral brake shoes l6 and linings ll, each shoe having predeterminedl'y located radial holes in its platform i8 and each lining having corresponding holes registering with the holes in the platform. The holes in the platform are arranged in laterallyor axially spaced series at 0pposite sides of the web with the holes of each series arranged in a row and circumferentially spaced from each other. In the instance, the circumferential spacing of the holes of one series is different from that of the holes of the other series (Fig. 12), the holes of both series at each end of the platform being aligned laterally or axially of the platform and the intermediate holes of each series being staggered relative to the other.

The work holder is preferablymade of the two circular disks I9 and 20 fixedly secured together by suitable means such as head screws and 00- operating to form thechannel M, the disks being journalled on the horizontal shaft 2| which extends between and is mounted in the frame plates 22 and 23. These frame plates rest on and are fixedly secured to the base 24 which in turn is supported on and fixedly secured to the table 25. Each of the disks carries two angularly spaced series of circumferentially spaced anvils extending radially beyond the disk and adapted to engage the radially inner sides of the platforms of the shoes. The anvils of both series are arranged in rows and register with the holes in the shoe platforms and have their radially outer end portions shaped to form heads on the inner ends of the shanks of the rivets at the radially inner sides of the platforms. The rivets are of conventional construction with their inner ends, which are to be turned over and formed into heads, made hollow. More particularly each series of anvils comprises the leading anvil 26 and the succeeding anvils 27. Each leading anvil 25 is formed with the body 28 extending radially of the disk and with the axial pin 29 which is resiliently urged radially outwardly of the disk by the coil spring at to normally extend through the holes in the leading ends of the brake shoe platform is and lining ii. The pin is movable downwardly by the rivet as the latter is forced downwardly by the rivet driver or plunger of the riveter head and finally comes to rest in a position to cooperate with the body of the leading anvil to effect the heading of the lower end of the shank of a leading rivet. More particularly the upper end of the pin is tapered and the upper end of the body of the leading anvil has a conical cavity into which the tapered upper end of the pin extends when the in is in its lowermost position. As a result the pin spreads out the lower end of the shank of the rivet into the cavity. Each succeeding anvil 2'! is formed with the solid body 3| having at its upper end a cavity like that formed by the body of the leading anvil and the pin in its lowermost position. With this construction the leading anvils of the series of anvils of both disks cooperate to effectively angularly position the shoes and linings about the periphery of the work holder.

Each riveter head i is mounted on the column 32 of the riveting machine beyond the ends of the table 25 and to accurately position the riveter heads so that their rivet drivers or plungers 6 are in the planes of the axes of the anvils 26 and 21 carried by the holders, there is the block 33 secured to each column 32 and the bolt 34 nonrotatably secured to the base of the frame 2 of each riveter head I and slidably engaging the upper end of the block and threadedly engaged by the nuts 35 which are adapted to abut the opposite sides of the block. With this construction the riveter heads may be adjusted toward and away from each other to locate the rivet drivers or plungers with their axes in the planes of the axes of the rows of anvils.

To index the holder [3 so that the anvils are successively axially aligned or registered with their respective rivet drivers or plungers, means is provided for angularly advancing the holder about its axis step by step and for also holding the holder in each position of angular adjustment. In detail, 36 is an indexing plate concentric with and fixedly secured to the disk i9 and having the concentric inner series of angularly spaced fixed abutment pins 31 secured thereto and extending laterally therebeyond and the concentric cuter series of angularly spaced holes 38 extending transversely therethrough. The pins and holes are arranged in pairs with the axes of the pin and hole of each pair in a radial plane and the hole radially outwardly of the pin. Certain of the pairs of pins and holes are located diametrically opposite the anvils, other pairs of pins and holes being diametrically opposite the gaps between the series of anvils for use in indexing the holder.

39 is a horizontally reciprocable slide movable chordwise of the holder and guided by the upper and lower gibs 4G and iii (Figs. 5, 8 and 9) which are fixedly secured to the frame plate 22. 52 is a dog pivotally connected at one end by the vertical pivot pin 53 to the slide and urged laterally toward the indexing plate 36 by means of the coil spring 4 carried by the slide, the frame plate 22 being formed with the horizontal elongated opening it through which the dog extends. The free end of the dog has the abutment face 46 for successively engaging the abutment pins 31 during the forward strokes of the slide 39 and thereby angularly rotating the holder step by step, the forward movement of the slide stopping when the particular abutment pin engaged by the abutment face is in its lowermost position and diametrically opposite a rivet driver or plunger 8 of a riveter head so that the uppermost anvil extends vertically in axial alignment or registration with a rivet driver or plunger. The vertical height of the abutment face ib, it will be noted, such that the abutment face is engageable with the abutment pin next in rear of the lowermost abutment pin so that during the forward stroke of the slide the next in rear abutment pin moves downwardly along the abutment face of the dog. To provide for the dog moving over the next in rear pin during the rearward stroke of the slide, the dog has the cam 4? near its free end and on its side facing the abutment pins, the cam being adapted to ride over the next in rear pin and thereby swing the dog about its vertical pivot pin laterally against the resistance of the coil spring M.

For frictionally resisting rotation of the work holder there is the spring pressed shoe S mounted on the frame plate 23 and slidably engaging the outer side of the disk 26.

28 (Fig. 4) is a positioning pin carried by the frame plate 22 and engageable successively in the holes 33 when in their lowermost position. The positioning pin is slidable in the flanged bushing 39 which extends through the frame plate 22 and is threaded into the cup-shaped nut 50 at the same side of the frame plate as the slide 39. The positioning pin has the reduced shank 5! which extends through the bottom of the nut and has secured to its end the pull out collar 52. 53 is a coil spring within the nut and encircling the reduced shank and abutting the bottom of the nut and the enlarged portion of the pin for yieldably urging the pin in a direction to extend into a hole 38 when in registration with the pin.

For horizontally reciprocating the slide 39, there is the actuator plate 5 fixedly secured to the slide 39 and carrying the roll 55. There is also the cam wheel 55 journalled on the shaft 2| and having the cam groove 57 (Figs. 3, 4 and 8) receiving the roll 55. The cam wheel is driven continuously during the setting of the rivets in one brake band by the electric motor 58 by means of the sheave 59 and the belt til, the sheave being at one side of and keyed to the cam Wheel 56.

For the purpose of withdrawing the positioning pin 43 from the lowermost hole 38, there is the cam 6! located between the slide 39 and the actuator plate 54 and secured to the actuator plate by suitable means such as the dowel pins 62. This cam has the furcations 63 between which a boss on. the collar. 52.. extends. These. furcationsl ex.-.

tendbetween the nut 50 and pullout collar 52aand= havexthecamfaces 6.4: engageable withthe pull out: collar upon the. rearwardstroke of the slide.

head. downwardly, I have provided a solenoid. 65.

for each riveter headand a, means for controlling the energizationof eachsolenoid. Each solenoid is operatively connected to the clutch ll of the respective riveter head to connectthe associated crank shaft 9. and fly. wheel l0. whenthe electric circuit including the solenoid is made. The

means for. making and breaking the electric cir-.

cuitof the solenoid 65 atthe lefthand side ofthe riveting machine comprises the solenoid con.- trolling time limit switch 66: and the twoinner series. of angularly spaced control pins 66., 663

and. 66 for operating said limit switch, these control pins being concentrically mounted on and projecting laterally beyond the face of the ring 6'! which is concentrically fixedly secured to the disk l9. The means for making and breaking the electric circuit. of the solenoid at the righthand side of the riveting machine comprises the solenoid controlling time limit switch 68 and the two outer series of angularly spaced control pins 68" 6B 68 and 6B for operating said limit switch, these control pins also being-concentrically mounted on and projecting laterally beyond the face of the ring 61. The limit switches 66 and 68 are mounted on the frame. plate 22 and are conventional limit switches of standard construction. Each limit switch isprovided with the pivotal arm 69 having at its free end portion the abutment pin 69' which is movable by a control pinengageable with the abutment pin. The control pins 66, 56 and 66 are positionedto operate theli-mit switch 56 and successively make the electric circuit to the solenoid B5 of the lefthand side riveter head when the registering holes of the lefthandrow in the lining ii .andplatform I 8 are successively brought into registration with the rivet driver or plunger of the lefthand riveter head. The control. pins 68, 68 683, and68 are positioned to operate the. limit switch 68 and successively make the electric circuit to the solenoid 65 of the righthand side riveter head when the registering holes of the righthand row in the lining I1 and platform 18 are successivelybrought into registration with the rivet driver or plunger of the righthand riveter head.

The timing of the indexing of the holder I3. is such that the holder is held from rotation by pin 48 while the rivet drivers or plungers of the riveterheads are moved downwardly to effect the riveting and then upwardly to clear the lining. When the rivet drivers or plungers have been moved upwardly to their normal or 01f positions, the clutches are disengaged in a well known manner by cams.

To stop the rotation of the work holder I3 I have provided the stop switch in the circuit to the work-holder motor 58-and the two stop control pins 1! for operatingthe switch. The

stop. switch is of standard construction and is adapted to break the electric circuit to the electricmotor 58.. The stop controlpins are mounted on and project laterally .beyondcthe. disk.20 and 61 are positioned. to operate; the-1 stop switch; .10.

whichis. mountedon.theframaplate 23; after-the liningand brake shoe,.which has beenfed to. the rear of the holder by the-rotation thereof, has

been completely riveted and before riveting of the lining: and brake. shoe at. the front of the.

holder begins. More. particularly. the stop control pins are diametrically opposite each. other between the last of the anvils 21 ofoneseries and:

the leading anvils 26 of thenext series. After the electric circuit to the electric motor 58 has been broken, this circuit. cannot. again be made until thestarter button 12:; is. manually operated, this;

starter button. as shownbeing mounted onv the floor for foot. operation.

To pressthelining I]: against theplatform l8 of the: shoe |6= so thatthe. liningvfltstightly.

against the platform, I: have provided, the pressure: roll. 13' which is. engageable with the-lining.

in advance of the rivet drivers-or. plungers. This pressure roll is rotatablynmounted on. thefront: end of the lever M: which is pivotally connected. intermediate its endsby the pivot pin: 15 tothe' frame bar l6: of the. riveting machine. The rear end of the lever'extends between the furcations by a suitable-spanner wrench to effect rotative adjustment ofthe collar. The-nut-83lis clamped to the table 25xby the plate 84 which is bolted to the table. The plunger B1 is. formed-with the longitudinally extending recess 85' extending upwardly from its lower end into which freely extends the stud as threadedly engaging. the table 25. 81 is a coil spring within the recess between its upper end and the plate88-abutting the upper end of the stud. Thiscoil spring yieldably urges theplunger 8i upwardly to yieldably urge the pressure roll 13 downwardly through the lever 14 on which it is mounted- Thestud 86 is adjustably. mounted in the table to vary the. force exerted by the coil spring 81, and to further vary and secure finer adjustment of the pressure exerted by the pressure roll thereis the inner coil spring 89 which is weaker than the coil spring 81 and which abuts the upper end of the recess in the plunger ill and theupper face of the nut 88' threaded on the inner stud 88- adjustably threadedly engaging the stud 66. The inner stud is encircled by the lower end portion of thecoil spring 81 so that thisinnerstud serves to pilot this coil spring. The inner coilspring 89 encircles the rod 98, which slidably engages the. upper end portion of the plunger. 81 and also. the upper end portion of the inner stud 88. and isyieldably urged upwardly by the coil spring 94, the ar rangement being such that the rod lw'serves as a pilot for the inner coil. spring and is movable.

downwardly as the plunger 81 is moved. downwardly. For limiting the upward-movement of.

To laterally position: the trailing end of: the

7 lining IT on the platform I8 of the shoe I6 when the shoe and lining are placed on the holder I3, I have provided the positioning heads 93 (Figs. 5, 6 and 7 having the laterally offset surfaces 93' and 93 for engaging the opposite edges of the platform and lining respectively. These heads have the horizontally extending plungers 94 slidably mounted in the supports 95 at the upper ends of the arms 96 which latter are secured to the base 24 at the front of the machine, the positioning heads extending closely adjacent to the frontmost portions of the peripheries of the disks I9 and 20 of the holder. These positioning heads are urged toward each other by the coil springs 91 abutting the plungers and the supports and are limited in their movement toward each other by the stops 98 secured to the supports. The portions 99 of the outer faces of the positioning heads beyond the lining positioning surfaces and the stops are preferably bevelled to laterally uide the shoes and linings while being inserted in place. With this construction, the positioning heads laterally position the trailing end of the lining with respect to the trailing end of the shoe platform while the pins of the leading anvils position the leading end of the linin with respect to the leading end of the shoe platform when the shoe and lining are first inserted into place. Also, the positioning heads continue to function until the shoe and lining have been sufficiently riveted together to maintain the proper lateral position of the lining on the shoe.

For the purpose of removing the shoe and lining after they have been riveted together, the

stripper I (Fig. 6) is provided extending into the lower portion of the channel I4 of the holder and engageable with the leading end of the shoe. This stripper is preferably in the nature of a plate resting on the base 24 and secured to the plate 22 by the bolt IllI.

Assuming the riveting machine to be at rest with the uppermost control pin lI slightly to the left of the vertical plane of the rivet drivers or plungers 6 of the riveter heads I (the at rest position being the Fig. 6 position turned slightly counterclockwise) and also assuming that a shoe and lining have been mounted on the front portion of the holder I3 and positioned by the pins 29 of one of the pair of leading anvils 26, the operator starts the fly wheels is of the riveting machine by depressing a suitable button to make the electric circuits to the riveter motors I2 and then by depressing the work-holder starter button I2 makes the electric circuit to the workholder motor 58 to set the cam wheel 56 into continuous rotation. Upon rotation of the cam wheel 56 the slide 39 is first moved rearwardly (to the right in Fig. 3) by the cam groove 51 of the cam wheel 56 engaging the roll 55 on the actuator plate 54 which is secured to the slide 39 to thereby pull cam-slide 6| rearwardly to disengage the positioning pin 48 from the lowermost of the holes 38 and hold the positioning pin in inoperative position until the work holder I3 in the forward movement of the slide 39 has been indexed a sufficient distance to position the lowermost hole beyond the positioning pin. The rotative advance of the work holder is effected upon the forward movement of the slide by engagement of the abutment face 46 of the dog 2 with the pin 31 next in rear of the positioning pin 48. At the end of this forward movement of the slide said pin has been advanced to its lowermost posi tion at which time, the cam slide BI having released the positioning pin 48 during forward movement of slide 39, the pin 48 engages the next hole and the work holder is held from rotation. Just before the leading anvils 26 come into axial alignment or registration with the rivet drivers or plungers 6 the control pins 66' and 68' engage respectively the pin 69' of the levers 69 of the solenoid controlling time limit switches 66 and 68 and these limit switches make the electric circuits through the solenoids B5 of both riveter heads thereby energizing the solenoids just long enough to trip both clutches I I to connect the fly wheels I!) to the crankshafts 9. The widths of the abutment pins 59' of the levers 69 of the limit switches controls the length of time that the solenoids are energized, tie-energizing taking place substantially simultaneously with the pin 48 engaging the above referred to next hole 38. The crankshafts 9 lower the rivet drivers or plungers 6 to carry the rivets downwardly into the registering holes of the lining and shoe platform, the

rivets depressing the guiding pins 29 of the leading anvils. At the lower end of the strokes of the rivet drivers or plungers the lower ends of the shanks of the rivets are headed by the guiding pins 29 and bodies 28 of the leading anvils after whichthe rivet drivers or plungers are raised to their uppermost positions and the clutches II are automatically thrown out or moved to disengaged position by their spring controlled cams, the crankshafts having made one revolution. It will be noted that during the riveting operation, the positioning pin I8 remains in engagement with the lowermost hole 38 although the slide 39 is being moved rearwardly, this being efiected by the distance the positioning pin extends into the hole and also by the dwell of the cam IiI in ad- Vance of the cam faces E l.

The steps of indexing the holder and riveting the lining to the shoe platform continue to be carried out during which the control pins 66 I58 and 68 successively operate their respective limit switches after which the last control pins 66 and 68 of their series simultaneously operate their respective limit switches completing the riveting of the lining to the shoe. During these riveting steps the pressure roll 73 holds the lining against the shoe platform, the pressure roll engaging the leading end of the lining as it and the shoe are advanced after the first riveting step. After the riveting of the lining and shoe has been completed the holder is indexed one rotative step, without operation of the rivet setter mechanism, to advance the trailing end of the riveted lining and shoe so that it will not interfere with the insertion or mounting on the front portion of the holder of another unriveted shoe and lining. Upon completion of this last rotative step of holder I3 the succeeding pin lI operates the stop switch ID to break the electric circuit to the motor 58 and the intermittent rotation of the holder I3 stops. After the unriveted shoe and lining have been positioned on the holder the starter button I2 is'again depressed to start the motor 58 to again effect intermittent rotation of the holder I3, during which the holder is first indexed one intermediate rotative step and then another rotative step before the pins 8% and 68' engage the abutment pins 59' of the levers 68 of their respective limit switches es and 68. During the intermittent rotation, the newly added lining is riveted to the shoe platform and during the first portion of this riveting operation the previously riveted lining and shoe are stripped from the holder by the stripper I00.

What I claim as my invention is: 1. A machine for riveting arcuate work elements having registering substantially radial holes arranged in a plurality of series spaced each series of holes having a rivet driver mov able toward and away from said holder substan tially radially thereof, separate means for moving said drivers, means for rotating said holder step by step to positions successively registering said anvils with said drivers, separate means forcon trolling the operation of each of said driver moving means each having a limit switch, means on said holder for operating each of said limit switches, said last mentioned means being positioned to operate the limit switches controlling the operation of the moving means for the drivers when the drivers are in registration with an anvil.

2. A machine for riveting arcuate work elements having registering substantially radial holes arranged in a plurality of series spaced laterally of the work elements comprising a rotatable holder for peripherally receiving the work elements, a plurality of series of substantially radially extending anvils on said holder for registering with the holes; a separate riveter head for means for controlling each of said driver moving means, means for rotating said holder step by step to positions registering said anvils with said drivers, and separate means including a different series of members carried by said holder for each controlling means for independently initiating operation of said controlling means.

3. A machine for riveting work elements having registering holes arranged in a plurality of series spaced laterally of the work elements comprising a rotatable holder for the work elements, a plurality of series of anvils on said holder for registering with the holes, a separate riveter head for each series of holes having a rivet driver movable toward and away from said holder, means for moving said drivers, means for rotating said holder step by step to positions registering said anvils with said drivers, and means for controlling the operation of one of said driver moving means independently or another, said means comprising clutches, means for operating said clutches, means for controlling the operation of said operating means and means movable in unison with said holder for operating said controlling means.

i. A machine for riveting a brake shoe having an arcuate platform and a lining, the platform and lining having registering substantially radial holes arranged in a plurality of rows spaced laterally of the platform and lining comprising a rotatable holder for the shoe and lining, a plurality of rows of anvils on said holder for registering with the holes, a separate riveter head for each row of holes having a rivet driver movable toward and away from said holder, separate means for independently moving each of said drivers, means for rotating said holder step by step to positions registering said anvils with said drivers, means for controlling the operation of one of said driver moving means independently of another, .and

means on said holder for initiating operation of said controlling means.

5. A riveting machine comprising a rotatable Work holder, circumferentially spaced anvils on the periphery of said holder, a rivet driver reciprocable toward and away from said holder substantially radially thereof, means for reciprocating said driver, normally rotating members, reciprocable means operable by one of said members for advancing said holder step by step to positions registering successive anvils with said driver, and means for controlling the operation of said driver reciprocating means by the other of said members, and means on said holder for initiating operation of said controlling means.

6. A riveting machine comprising a work holder rotatable about a horizontal axis, circumferentially spaced anvils on the periphery of said holder, a rivet driver reciprocable toward and away from said holder substantially radially thereof, a crank shaft for reciprocating said driver, normally rotating members, reciprocable means operable by one of said members for advancing said holder step by step to positions registering successive anvils with said driver, a clutch for coupling said crank shaft to the other of said members, means for controlling the operation of said clutch and means on said holder for initiating operation of said controlling means.

7. In a machine for riveting a brake shoe and lining having registering holes arranged in series, a rotatable holder for peripherally receiving the brake shoe, series of circumferentially spaced peripheral anvils on the periphery of said holder for registering with the holes, one of said anvils being provided with a movable pin engageable in the registering holes in the leading ends of the shoe and lining to position the leading ends of the shoe and lining on said holder and with respect to each other, and laterally movable abutments adjacent said holder and engageable with the opposite edges of the trailing end of the lining to laterally position the same with respect to the trailing end of the shoe, said abutments having bevelled faces diverging with respect to each other away from the periphery of said holder.

8. In a machine for riveting a webbed brake shoe and lining, a rotatable holder for peripherally receiving the brake shoe and having a radially extending channel for receiving a web of the brake shoe, series of circumferentially spaced peripheral anvils on the periphery of said holder at opposite sides of the channel, one of said anvils being provided with a movable pin engageable with the leading end portions of the shoe and lining to circumferentially position the shoe and lining on said holder and laterally position the leading end portion of the lining relative to the leading end portion of the shoe, and spring pressed laterally movable abutments for engaging the edges of the trailing end portions of the shoe and lining to laterally position the trailing end portion of the lining with respect to the trailing end portion of the shoe, said abutments having bevelled faces diverging with respect to each other away from the periphery of said holder.

9. In a machine for riveting a pair of work elements, a holder for the work elements rotatable about its axis and having concentric series of holes and pins, a slide reciprocable chord-wise of said holder, a dog movably mounted on said slide and successively engageable with said pin to index said holder on movement of said slide in one direction, a positioning member movable axially of said holder for successively engaging the holes at the end of the movement of said slide in one direction and means movable with said slide in the opposite direction to disengage said positioning member from the hole engaged thereby.

10. In a machine for riveting a pair of work elements, a holder for peripherally receiving the work elements and having concentric series of holes and pins arranged in pairs, a slide reciprocable chord-wise of said holder, a pivotal dog on said slide successively engageable with said pins to index said holder on movement of said slide in one direction, a positioning pin movable axially of said holder for successively engaging the holes at the end of the movement of said slide in one direction and cam means movable with said slide in the opposite direction to disengage said positioning pin from the hole engaged thereby.

11. In a machine for riveting a pair of work elements, a holder for the work elements rotatable about its axis, circumferentially spaced peripheral FRANK H. LE JEU'NE.

References Cited in the file of this patent UNITED STATES PATENTS Name Date Horton June 15, 1897 Havener Sept. 30, 1941 Number 7 584,590 2,257,379 

